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x in (-oo:+oo)
X/72-x = 2/7 // - 2/7
X/72-x-(2/7) = 0
X/72-x-2/7 = 0
1/72*X-x-2/7 = 0 // - 1/72*X-2/7
-x = -(1/72*X-2/7) // * -1
x = 1/72*X-2/7
x = 1/72*X-2/7
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